For some FORD models:
1. Disconnect the inertia switch harness connector
2. Turn key to ON position (Engine OFF)
3. Measure voltage of circuit between inertia switch harness connector and ground
4. If battery voltage is found, replaced Inertia Switch
5. Clear codes.
Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P0231 2009 Ford Fusion code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
The code will be set if a low voltage on the control circuit of the fuel pump relay is detected by the ECM.
The Powertrain Control Module (PCM) monitors the Fuel Pump Monitor (FPM) circuit. The test fails if the PCM commands the fuel pump ON and B+ voltage is not detected on the FPM circuit.
Need more information on how to fix the P0231 2009 Ford Fusion code? Get Access to Factory Service Manuals
Get the P0231 2009 Ford Fusion code diagnosed by a professional: Find a repair shop in your area